Backpack



FIG. 1 is a front view in perspective of a backpack showing my new design, in which a front flap is folded in a downward oriented position;

FIG. 2 is a front view in perspective of the backpack of FIG. 1 in a configuration in which the front flap is positioned from its downward oriented position to an upward oriented position;

FIG. 3 is a front view of the backpack of FIG. 1;

FIG. 4 is a rear view of the backpack of FIG. 1;

FIG. 5 is a left side view of the backpack of FIG. 1;

FIG. 6 is a right side view of the backpack of FIG. 1;

FIG. 7 is a top view of the backpack of FIG. 1; and,

FIG. 8 is a bottom view of the backpack of FIG. 1.

The broken lines in the figures illustrate portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 